"While it is true that many of the TdA members removed under the AEA do not
have criminal records in the United States, that is because they have only been in the United States for a short period of time."
That's the official position of the US government, in a court filing - that some of those deported did not have a criminal record.
(Even their membership in the org is an assertion/allegation, not one that's been proven in court.)